But when I made the folder "usb" this would work. Then also there was an error when I tried to print a test page that said:

QuotePrinter State: idle - if you have more than one S printer connected to this machine, please unload (and blacklist) the "usblp" kernel module as otherwise CUPS will not be able to distinguish your printers.

But when I restart the computer the "usb" folder disappears and the Printer State stays idle when trying to print a test page.